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Categories: Metal forming Food industry Manufacturing Metal forming Unit operations Articles to be expanded since January 2008 All articles to be expanded Articles to be expanded since August 2008 |
Summary Of: ExtrusionExtrusion may be continuous... The extrusion process can be done with the material hot or cold... Joseph Bramah patented the first extrusion process for making lead pipe... Alexander Dick expanded the extrusion process to copper and brass alloys... Extrusion of a round blank through a die... Extrusion of a round blank through a die... Extrusion of a round blank through a... Afterwards the extrusion is stretched in order to straighten it... Hot extrusion is done at an elevated temperature to keep the material from... Hot extrusion temperature for various metals... The extrusion process is generally economical when producing between several pounds and many tons... Cold extrusion is done at room temperature or near room temperature... The advantages of this over hot extrusion are the lack of oxidation... and fast extrusion speeds if the material is subject to... Warm extrusion is done above room temperature... Movement of the extrusion with relation to the ram... During extrusion the metal divides and flows around the legs... Typical extrusion presses cost more than... is greater than that need in the indirect extrusion process because of the frictional forces introduced by the need for the billet to travel... The maximum length of the extrusion is ultimately dictated by the column strength of the stem... The billet is used more uniformly so extrusion defects and coarse grained peripherals zones are less likely... In the hydrostatic extrusion process the billet is completely surrounded by a pressurized liquid... Most modern direct or indirect extrusion presses are hydraulically driven... Hydrostatic extrusion presses usually use castor oil at pressure up to 200 ksi... When the center of the extrusion develops cracks or voids... the chamber on the die to lubricate the extrusion as it is forced through the die... The extrusion will have a 1 mil thick layer of glass... extrusion is used to produce pipes... Extrusion has found great application in food processing... Krispy Kreme doughnuts are also manufactured by extrusion to keep the doughnuts uniform in shape and size... Extrusion is also used with... The maximum size for an extrusion is determined by finding the smallest circle that will fit around the cross...Encyclodia Page On: Extrusion |
